The position of three elements A, B and C in the periodic table are shown below : Give reasons to explain the following: (i) Element 'A' is a metal. (ii) Element 'B' has larger size than 'C'. (iii) Element 'C' has a valency - 3.

The position of three elements A, B and C in the periodic table are sh

1.	The position of three elements A, B and C in the periodic table are shown below : Give reasons to explain the following: (i) Element 'A' is a metal. (ii) Element 'B' has larger size than 'C'. (iii) Element 'C' has a valency - 3.
Answer» Solution :(i) ELEMENT .A. is a metal because it is present in group I (1 valence electron) and can LOSE electron easily. (ii) Element B has larger SIZE than .C. because it has more NUMBER of SHELLS than .C.. Also, B lies in the third period and has three shells whereas B lies in second period and has two shells. (iii) .C. being an element of 3rd group has three valence electrons, therefore its valency is 3.